18-Foot Round Heavy Duty Pool Liner Pad for Above Ground Swimming Pools - Protects Pool Liner, Prevents Punctures Weed Barrier FabricGround Shield Protects Your Pool Liner: This 18 foot round, heavy duty, extra thick, pool liner pad safeguards your above ground pool liner from punctures, tears, abrasions, and rips caused by rocks, roots, glass, and other sharp objects. It extends the liner's lifespan and reduces the risk of damage and costly replacements. The pad also provides a thin layer of cushioning underfoot, making the pool more comfortable to walk on. Extra Thick Above